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Commons JXPath example source code file (Function.java)

This example Commons JXPath source code file (Function.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons JXPath tags/keywords

function, function, object, object

The Commons JXPath Function.java source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.apache.commons.jxpath;

 * Extension function interface. Extension functions are grouped into
 * {@link Functions Functions} objects, which are installed on
 * JXPathContexts using the
 * {@link JXPathContext#setFunctions JXPathContext.setFunctions()}
 * call.
 * <p>
 * The Function interface can be implemented directly. However,
 * most of the time JXPath's built-in implementations should suffice.
 * See {@link ClassFunctions ClassFunctions} and
 * {@link PackageFunctions PackageFunctions}.
 * @author Dmitri Plotnikov
 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
public interface Function {

     * Computes the value of the function. Each implementation of Function
     * is responsible for conversion of supplied parameters to the required
     * argument types.
     * @param context can be used to acquire the context in which the
     *    function is being evaluted.
     * @param parameters function arguments
     * @return Object result
    Object invoke(ExpressionContext context, Object[] parameters);

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